Stropping device for safety-razor blades



Oct. 20, 1925- 1,557,601

J. F. MAGEE STROPPING DEVICE FOR SAFETY RAZOR BLADES Filed Feb. 14, 1922 2 Sheets-Sheet l M -llm "1NVENToR. 'v

` "ATTORNEYS,

oct 20| J. F. MAGEE STROPFING DEVICE FOR SAFETY RAZOR BLADES l Filed Feb. 14. 1922 2 Sheets-Sheet 2 ZZ Z4 K W" INVENTOR.

Patented 20, 1925.

UNITED STATES PATENTO Off-FICE.,

JAMEs- F. MAGEE, or sYRAcUsE, NEW-YORK, AssIGNon. or ONE-HALF 'ro LoUI `f .'ToHNsoNBncK, or sJYnAcUsE, NEW YORK.'

Application led ebruarylli,` 1922. Serial No. 536,403.

To all whom. it may con-cern.' Be it known that L JAMns F. MAGnn,-a citizen of the United States, and a resident 2 designates the blade holdin element and 3 the strop-ping element. he blade holding element, as here shown `is a supof Syracuse, in the'county of Onondaga\\porting strip or shelf supported at its ends and State of New York, have invented a certain new and useful Stropping Device l for Safety-Razor Blades, of which the folis particularly simple and economical in construction andv highly efficient vand durlowing is a specication.

This invention h s for itsobject a strop--` ping machine for sa ety razor blades, which able in use, andalso which strops both sides of the same edge of4 thel blade at the same time.v O

The invention consists in the novel features and in the combinations and constructions hereinafter set forth and claimed.

In describing this invention, reference is had to the accompanying drawings in which like characters designate corresponding parts in all the views. A

Figure 1 is a plan view of this blade stropping machine.

Figure 2 is ajside elevation thereof.

' Figure 3 is a sectionall view on line 3 3, Fig.

Figure 4 is a sectional view on line 4-4, v

Fig'. 1. A

igure 5 is an enlarged sectional view on line 5-5, Fig. 1.

Figure 6 is a view similar to Fig. 5 show ing the 'aws of the stropping element engaged with the blade.

Figure 7 is an end elevation looking to the left in Fig.` 3.

Figure 8 is a detail view of the cam.

This stroppingl machine comprises generally, a frame or casing, a blade holding element, a stropping element, one of said elements being reciprocally movable toward and from the other parallel to the plane of the blade, means for reciprocating the reciprocally movable element and means for controlling the engagement and disengagement of the stropping element with the blade during such reciprocating movement.

l designates the frame or casing which may beof any suitable form, size and construction, it being here struck up from sheet metal.

In the illustrated embodiment of my invention the stropping element is reciprocally movable and the blade holding element stationary.

in the side walls 4 of the `Casin-g 1 and a clamping or pressure device" 5 for pressing the 4blade against the shelf. The clamping device is lhere shown as a spring clip arranged with its ends in slots or notches in the side walls 4 of the ends and its intermediate part 6 looped to form a handle. The arms 7 ofthe spring on opposite sides of the loop normally extend upwardly from thev ends of the loop and the bends' connecting the ends of the loop and the arms 7 are formed with bosses 8 arranged to enter the holes 9, in the razor blades 10 as Gillette blades or the slots of some other types of'blades and hold the blades from movement on the shelf. vHowever, studs may be provided on the su ort for enterin the holes 9. pp g However, with other types of razor blades as shown in Fig. 5, formed with a single edgev and with a'folded back strip 411 the edge of one of the folds .of the back 11 lenhold of the loop 6 until the `bends connect# 'I ing said arms 7 and the loop 64 passes above the dead center line.

The stropping element comprises'av reciprocating carriage 13 and jaws carried by the carriage. The carriage 13' is a flat strip having its ends 12 slidable in the slots 15 in the opposite side walls 4 of the casing, and the jaws 14 are carried by spring arms 16 ixedat 17 to the carria' e. The jaws are located above and below t e plane of the blade held on the support 2. These jawsv carrying strops 18 or other abrading members at their free ends. arms 16 press the jaws toward each other onto the blade and press the strops against the upper and lower sides of the blade. The stropping element 3 is reciprocated by means The spring vided with a suitable crank handle 21 at its outer end. I

The means for opening and 'closing the jaws comprises a cam or a pair of cams 22 slidabl along the inner faces of the side wall 4, each cam being here shown. as forrned with a slot 23 for receiving the end portlon of the carriage 13, the cam having lift portions 24 which engage with laterally 4extending shoulders 25 at the end of the jaws 14.

The cams thus ride with the carriage 13 owing to the slot 23 and they are limited in their movement by stops in order to cause the lift portions to open the jaws vafter the jaws move out of engagement with the blade and to hold the jaws vopen until the carriage is moved toward the blade into position to permit the jaws to close on the blade. Movement of the cams with the carriage 3 are limited in one direction by suitable stop 26 and in the o posite direction by the shaft 19 against w ich the rear ends of the cams strike after the jaws have passed oi the blade.

During turning of the crank 21 the carriage 13 moves forwardly toward the blade, the lift portions 24 being under the lugs 25 of the jaws and holdin the jaws separated until the j-aws come a ove and below the blade whereupon the cams engage the stop 26 so that further movement of the cams with the jaws and carriage 13 is limited permitting the jaws during such further movement to close onto the blade.

Continued rotation of the handle 21 moves the carriage 13 and jaws in the opposite direction causing the strops which are now engaged with the blade to move oil' the end of the blade.

The cam moves with the jaws until it engages the shaft 19 The cams engage the shaft 19 after the strops have moved oil' the edge of the blade so that during continued movement of the jaws in a retrograde direction the lugs 25 thereon engage the lift portions of the now stationary cams causing the jaws to separate. Continued movement of the handle 18 causes the open jawsand cam to move toward the blade until the cams are limited by the stop 26 as before.

This stropping machine is particularly advantageous in that it strops both sides of the same edge at the same time and thus creates a sharper or better cutting edge than when such sides are stroplped alternately.

It is further particularly advantageous in that it consists of a. minimum number of compactly arranged parts.

What I claim is:

1. In a razor blade stropping machine, a

rame,.a blade holder, a reciprocally mov V able stropping element having strops ar' ranged to simultaneously engage opposite sides of the edge of the blade, meansOfor reciprocating the stropping element, and `means for opening thest'ropping element to receive the bladeduring movement of said element in one direction and for closing said element onfthe bl-ade during movement in the opposite direction, substantially Aas and for the purpose set fonth.

2. A razor blade stropping machine comprising a` body, a blade holder carried by the body, a reciprocally movable stropping element movable parallel to the plane of the blade and including opposing jaws having the body, a recip-rocally movable stroppingv element including opposing jaws having strops for engaging opposite sides of the edge of the blade, means for reciprocating the stroplping element, and means for opening the jaws during movement of the jaws toward the blade and for closing the jaws on the blade during movement of the jaws in the opposite direction. said means comprsing a cam coactng with the jaws to open and close the same and operable b v the stropping element. substantially as and for the purpose specified.

4. A razor blade stropping machine comprising a body. a blade holder carried by the body` a reciprocally movable stroplping element including opposing jaws having strops for engaging opposite sides of the edge of the blade. means for reciproca/ting the stropping element. and means for opening the jaws during movement of the jaws toward the blade and for closing the jaws on the blade yduring' movement of the jaws in -tbe opposite direction, said means com- `arising' a sliding Vcam extending between the jaws and coacting with the jaws to open and close the same land movable with the stropping element` and stops for limiting the movement of the cam with the stropping element before the strop'ping element reaches the limit of its movement in either direction, substantially as and for the purpose described.

- 5. A razor blade stro'oping machine comprising a frame. a blade holder carried by the frame` a reciprocally movable stropping element including opposing jaws having strops for engaging opposite sides at the edge of the blade, means for reciprocating las in theI opposite direction, said-means comprising a cam extending between the jaws and having lift port-ions arranged to coact with the jaws `to separate the same, and to permit the jaws to close, and stops for limiting the movement of the cam with the jaws before the aws reach the limit of their movement in either direction, substantially as and for the purpose set forth.

6. A stropping machine comprising a casing formed with slots in the side thereof, a blade holder, a reciprocating carriage guided in the slots and having jaws projecting toward, the blade holder, the aws being provided with strops on their opposing faces, a cam carried by the carriages and movable relatively thereto and having lift ortions for coacting with the jaws, the cam eing arran ed in the path of the carriage and having its lift portions arranged in the paths of t-he jaws during retrograde movement of the jaws and stops for limiting the movement of the cam with the jaws in either direction, substantially as and for the purpose described.

In testimony whereof, I have hereunto signed my7 name, at Syracuse, in the county of Onondaga. and State of New York, this 29th day of July, 1921.

JAMES F. MAGEE. 

